Telephone prepay-box.



F. L. FISHER.

TELEPHONE PREPAY BOX.

APPLICATION FILED AUG-20. 1915.

4 SHEETSSHEET l- Witness Invenior:

- 1/ RANK L.F|5HER F. L. FISHER.

TELEPHONE PREPAY BOX.

APPLICATION FILED Aue.20, l9l5.

Patented Mar. 21, 1916.

4 SHEETSSHEET 2.

Inventor.- P AKLFISHER Witness Hilly F. L. FISHER.

TELEPHONE PREPAY BOX.

APPLICATION FILED AUG. 20. I915.

Patented Ma'r. 21,1916. I

4 SHEETSSHEET 3.

Inventor: FRANK L. FlsHER lH/D . @JEM Mm;

Amy.

F. L. FISHER.

TELEPHONE PREPAY BOX.

APPLICATION FILED AUG-20, 1915.

1,176,045. Patented Mar. 21, .1916.

4 SHEETSSHEET 4.

INVENTOR. FRANK L. FISHER A TTORNE Y FRANK L. FISHER, 0F DECATUR,.ILLINOIS, 'ASSIGNOR T0 JOHN H. VJAIBJZ'I, OF CHICAGO, ILLINOIS. I v

TELEPHONE PREPAY-BOX.

Specification of Letters Patent.

Application filed August 20,1915. Serial No. 46,505.

To all whom it may concern Be it known that I, FRANK L. FISHER, a citizen of the United States, and a resident of Decatur, in the county of Mason, in the State of Illinois, have invented certain new and useful Improvements in Telephone Prepay-Boxes for Use in Telephone Systems, of which the following is a specification.

This invention relates 'to a pre-pay box which is suitable for use in a telephone sys- V provision of a telephone pre-pay box, duplicates whereof can be installed on party lines in an automatic telephone system to V establish, upon the removal of the-receiver from the hook provided therefor, a talking circuit, in a called station; and also in party lines in telephone systems which require a central operator, or an operator. at a central station, to establish upon the like removal of the receiver from its hook at a called station, a talking circuit with said central station, (said last named installation being accomplishedby merely changing the wiring in said pre-pay box, as is hereinafter set forth); the obtaining of a pre-pay box of the kind named which willnecessitate the deposit of a predetermined coin at a calling station prior to the establishment of a talking circuit with "21 called station; the obtaining of a prepay box of the kind named which. when a talking circuit has been obtained from a calling station, (subsequent to the removal of the. receiverfrom its hook and the deposit of a coin in said box), with a called station and said called station responds, will automatically deposit said coin in the state provided therefor; and which when said last above named circuit has been established and said called station does not respond, will automatically return said coin to a tray from which it can be obtained by i the party calling, upon the return-of the receiver at said calling station toits hook; the obtaining of a device whereby, when duplicate devices are installed on a party line and .not liable to a talking circuit has been established the same will not be broken or interrupted by the deposit of a coin in an additional and Patented Mar. 21, 1916.

like pre-pay box on said party line; and a device by means of which, when a coin is deposited in said additional pre-pay boii, as last above set forth, the party so depositing said coin is advised (by listening) that a circuit has already been established and said party line is busy, and thereupon upon the return of histreceiver to its hook, the coin so deposited by him in said additional prepay box'will be automatically discharged from said box and returned tohim.

Additional objects sought to be obtained are: a pre-pay box which is simple in construction, readily understood, easily operated,

get out of order, and economically made. i p I One of the important objects of the pres ent invention is to so inter-relate-and interconnect the signaling and'selector mechanism and the listening and talking mechanism, ina two line automatic telephone system, that it is imperative for a calling party todeposit a coin in the coin box of the device before he. can operate the signaling mechanism of his station for the purpose of actuating the selecting mechanismiin the exchange to secure connection with a called station: and another object, to which particular attention is directed, is to so accomplish the above recited results as to make it 1 certain, when a coin has been deposited as above set forth, said signaling mechanism operated and the connection established; the following results will automatically occur,

to wit, if the receiver at the called station is not removed from its hook prior to the return of the receiver at the calling station to its hook the coin will be returned to the party calling, and if the receiver at said called station is removed from its hook said coin will thereupon be deposited in the safe at the calling station; thus making itvunnecessary for the party at. the calling station to perform any additional operation, either to deposit the coin in the coin safe or to recover it, so that control of the coin, after its deposit in the box, is automatically controlled.

In the drawings accompanying and forming a part of th1s-specification, Figure 1 is a bottom plan view of the selective mechanism in a telephone stand of an automatic telephone system, adapted to be used in a u line equipped with, pre-pay coinboxes embodying this invention. ig. 2 illustrates'a vertical section,'on line 22 of Fig. 1, (on

an enlarged scale) viewed in the direction indicated by the arrows; the parts shown being turned into an upright position. Fig. 3 is a vertical section, (enlarged from Figs.

. 1 and 2 and in an upright position), showing the ,base and standard of the telephonestand which is alsoillustrated in Figs. 1, 2

and 4. Fig. 4 illustratesa detail section,

taken on line -4'4: of Fig. 1, viewed in'the direction indicated-by the arrows. Fig. 5

illustrates avertical section-of a pre-pay box embodying this invention,. taken on line 55 of Fig. 6, viewed in the direction indicated by the arrows. Fig. 6',illustrates a vertical section, taken on line 66 of Fig.

5, viewed in the direction indicated by the arrows. Fig. 7 illustrates a horizontal section taken on line 7-7 of Fig. 5, viewed in the direction indicated by the arrows. Fig. 8 is an end view of the armature and coils which are illustrated in Fi 7*,- showing the float arm or bar of the evice, by broken lines. Fig. 9 illustrates an enlarged detail of said float arm, in side elevation, with the several coin actuated movableparts thereon in normal'position. Fig. 10 illustrates alike view of said float arm as .does Fig. 9, with the said movable parts in an actuated posie tion, that is, as when a coin is on said float arm. Fig. 11 is a dlagrammatic'view of a.

,stalled device), and of the several parts-of an automatic telephone stand and the wiring thereof, with the receiver of said telephone assumed to be on .its hook. -Fig. 12, is a diagrammatic view of a telephone as installed in a telephone system requiring a central operator and equipped with 'devlees embodying this invention, with the receiver assumed to be ofl its hook, and of a coin box embodyin this invention, showing the" wirin thereo as required when the same is I insta ed in said central operator system,

with the coin'actuated parts in a normal position.

nate a given part indicates said part' throughout the several figures of the drawing, wherever the same appears.

g 15 2" 3", 4", and 5, designate posts, or' terminals, 0

f a telephone instrument; and 1, 2, 3, 4, and 5, designate corresponding posts'or terminals in a pre-pav coin box emodying this invention: Land 4 being what' are termed the line posts in a two line sys- 1", 2", 3", 4", and 5", are flexible wires, electrically connecting corresponding posts or terminals of the telephone instrument with those of the coin box.

\V represents a pre-pay coin box.

X, X and X" represent a coin run way and branches therefrom; one' of said branches arrangedto discharge into the coin safe of the device and theother into a tray in front of the said box; and Y, Z are line wires.

6 represents the base of a telephone standard; 7 the vertical tube forming the standard; 8 a lever fulcrumed -at 9 to said standard, and 10 a vertical movable rod which is attached to lever 8 by pin or bolt 11. The

lever 8 is kn'own inthe art, and hereinafter termed, the receiver hook. 12 is arepresentation ofa spring on the lower end of rod 10, and 13 is insulating material. Spring 12 is adapted to yieldingly maintain rod 10 in a depressed position, butsaid spring is not of suflicient resiliency to hold saidrod in said depressed position when the telephone receiver (14') is on said hook, (8).

15 represents a telephone transmitter; 16

a condenser; and 17 a bell.

.18 represents a rotatable cam, and 19, 20,

21 and 22, respectively, spring contacts of the selecting" mechanism of an automatic telephone. Spring contacts 20, 21 are lllllS- .trated as being placed on spring leaves whichare integral, as ,isthe usual construction.

those numbered from 6 to 22, all inclusive,

.as also coinbox W', and, of course, line wires 7 Y and Z, are found in all automatic telehones of'ordinary construction, which areinstalled in' a two wire line; and are illusj The several elements W, X, X, X", and

23, (Figs. 2, 3, 4, and 11) represents an electrical contact point. 24, 25, and 26, (in the above recited figures) and 27 28 and 29, (Figs. 5, 7, 9,10, 11, and 12) represent electrical contact *points mounted on leaf springs, and are termed, in the art, spring contacts. Said leaf springs are electric conductors and are mounted on insulating material, (35). A reference character applied to desig In Figs 5 to 12, all inclusive a pivoted arm or bar, which is hereinafter termed a} float bar, is-illustrated and designated by the nuineral30. 31 are the pivotson which float bar 30 turns, and 32 is an-armature which is spring which is illustrated as secured-to the upper side of-flpat bar 30; 34 is a block or pin-of insulating material which is inter I posed between spring 33 and the leaf of spring contact 28, to transmit deflection of said spring 33, (by a coin on said float bar) to said spring contact., Spring 33 is normally in position with contacts 27 and 28 in electrical connection, but is not of sufficient resiliency to remain in said normal position when a coin is deposited on the float arm and against the free end thereof. When said spring 33 is in a raised pos tion the spring contacts 27 and 28in electrical con- I nection, the contacts 28 and 29 are not in I ment, (Fig. '11), 36 illustrates an electric 35 electrical connection. The free end of said spring 33 (and of float bar 30) projects into runway X, in position to receive (on said float. bar)-a c'oin deposited in said runway, and said coin, so deposited being received on said float bar-and deflecting said spring 33,

the electrical contact of contact points '27 and 28 is broken, and an electric contact between contact points 28 and 29 is made, (as

is illustrated in Fig. I

Referring back to the telephone instruconductor from terminal 1 to the leaf of spring contact 24; 37 a like conductor from terminal 2 to spring contact 23; 38 aconductor from terminal 3 to spring contacts.

and 21; 39 a conductor from terminal 4 to spring contact 19; 40 a conductor from ductor from spring contact 26 tospring terminal 5 to spring contact 25. 41 a concontact 22; 42 a conductor from spring contact 22 to telephone receiver 14; 43 a con- (luctor from receiver 14 to telephone trans: mitter 15; and 44 a conductor from transmitter 15 to spring contacts-20, 21.

It will be observed that direct electric connection is made between contact 26 and receiver 14 by means of conductors 41 and 42; and also, direct connection is made hetween terminal 3 and telephone transmitter 15. by means of conductors 44 and 38. The line wires (Y, Z), are. electricall connected toterminals 1 and 4; and terminal 1 is electrically connected to terminal 1 by means of flexible conductor 1". In like manner terminals 2 and 2 are electrically connected by means of conductor 2"; 4 and 4 by conductor 4?; and 5 and 5 by A In the coin, box (see Figs.- 5 and 7), 51 represents a permanent magnet; 52, 53 electromagnetic coils; and 54, 55 the soft iron cores of said coils. "Magnet 51 serves to magnetize cores 54, 55, when no current is flowing through coils 52, 53, (in the ordinary way), making the ends of said cores which are adjacent to armature 32 positive andthe other ends negative. When acurrent is flowing through. either of said .coils in one direction the positive end of the core of the coil through which said cur-1 rent is flowing is increased; and when acurrent is flowing through said coils,'or either of them, in the opposite direction said permanent magnetism of the core is dimin-v ished; and if said oppositely flowing current is suflicient said end of the core is oppositely magnetized so as to,energize it. 1

The float arm 30 and armature 32 are joined so that the position of said arma ture determines the position of the float arm, and 56 represents springs which yieldingly hold said armature in a' neutral position, which is its normal place,- so that a coin deposited on the float arm will be retained thereon.

57 represents a resistance coil, (see Figs. 5, and 11).

58 is an electric conductor which is connected to terminal 2'and coil 53; and 59 a like conductor connected in like manner to terminal 3 and spring contact 28. 60 is a like conductor connecting terminal 4 and spring contact 27; 61a like conductor connecting terminal 5 and coil 52; 62 a conductor connecting the other end of coil 52 with one end of resistance coil 57; 63 a conductor connecting the other end of coil 57 with spring contact 29; 64 a conductor connecting spring contact 29 with one end of coil 53;

65a conductor connecting terminal 1 with condenser 16; 66 a conductor connecting condenser 16 with signaling device, (or ringer) 17; and 67 a conductor connecting signaling device 17 with terminal 4, (see Fig; 11).

When' receiver 14 is on its hook, 8, (as in Fig. 11), and also when said receiver is off its hook, a closed circuit exists from one line wireto the'other, in the coin box, this circuit being at all times unbroken, (being bridged across said line'wires); and this circuit, which I term' circuit No. 1, comprises 1. Terminal 1, (see Fig 11'), conductor 65, condenser 16, conductor 66, signaling device 17, conductor 67, and terminal 4. On takin receiver 8 off its hook, at what I call a calling station, a circuit is established which I term circuit No. 2, and which comprises:

' 2. Terminal .1, (see Fig. 11), conductor 1", 7

terminal 1, conductor 36, spring contacts 24, 25, 26, conductors 41-, 42, receiver 14,

m1 3, conductor 3",-terminal 3, conductor 38,spring contacts 20 and 19, conductor 39,

terminal 4, and conductor 4 back to termi- 'nal 4. This circuit being on one side of the 'spring 33, pin '34 and spring contact- 28.

The electric connection between spring contacts 27 and 28, (illustrated in Figs. 9 and 11), is broken, (see Fig. 10), and the last above described circuit (3) is broken. This also cuts the collecting coil 52 and resistance 57 into the circuit, as follows,

4. Terminal 1, (Fig. 11), conductor 1',

terminal 1, conductor 36, spring contact 24,

spring contact 25, (receiver 14being olf its hook 8), conductor 40, terminal 5*, conductor 5*, terminal 5, conductor 61, .coil 52, con- 3 ductor 62, resistance'57',conductor 63, spring contact 29, spring contact 28, conductor 59, terminal 3, conductor 3, terminal 3, conductor 38, spring contact 20, spring contact 19, conductor 39, terminal 4, conductor 4",

and'terminal 4. This circuit has a current 'flowing through it, but saidcurrent is in the wrong direction to energize coil'52, andcoin.

68 will, under these conditions, remain on float bar 30 until the calling station has established 'a' circuit with a called station, (hereinafter described) and until said called station is put on a talking circuit by the removal of the telephone receiver from its hook; whereupon the current is reversed, and coil 52 is thereby energized and the coin is discharged by means of the floatbar 30 being moved. The coin is thus, under the conditions named, automatically deposited in runway X and coin safe W. Upon the discharge of the coin from the float Bar the'electric connection betweenspring cont'acts 27 and 28, is restored, said spring contacts resuming the position which is illustrated'in Figs. 9 and 11, If a party at a' called station should not lift orremove said receiver at said called station-from its hook Hence the estabhshed talking clrcult'would and the party at the calling station replaces the receiver at said calling station on its hook, this circuit, (4) is broken, by the separating of spring contacts 24 and 25, as is illustrated in Fig..'11. The coil 53 is, at such time in condition to retu'rn thecoirr to the calling partv; circuit which I will term.

5 being established, as follows',

' 5. Terminal. 1, (Fig. 11), conductor 1", terminal 1, conductor 36, the spring contact 24, contact 23, conductor 37, terminal 2, conductor 2*, terminal 2, conductor 58, coil 53, conductor 64, spring contact 29, spring f contact 28, conductor 59, terminal 3, conductor 3", terminal 3,conductor. 38, spring con-. tact 20, spring contact 19, conducto r 39, termmal 4, conductor 4", and terminal 4.

While a call is being made, the required im-' pulses of the selective mechanism at'the calling station are transmitted on the circuit which I will term circuit 6, which ,is,.-

6. Terminal 1, (Fig. 11) conductor 1",.

terminal 1, conductor 36, spring contacts 24, 25, 26, conductor 41, spring contacts 22,

21,. 20,19, conductor 39, terminal 4, conductor 4", and terminal 4. During the-time" the selecting mechanism'is 'not being-operated-at the calling station, to establisha circuit with a called station, (as last above set forth, and a coin being on the float bar), the

receiver 14 and transmitter 15 are, in series Q bridge across the 'coil 52-, thereby acting as a shunt. This bridging circuit I term. 7.. VVhilesaid selecting 'mechanismis being operated the transmitter, receivenand coil 52. are shorted 'out through spring contacts.

21, 22.i Circuit 7 -comprises,--

7. Terminal. 1, (Fig. 11) conductor 1", terminal 1 conductor 36, spring contacts 24, 25,26, (receiver 14 being ofi of hook 8) conductors 41, 42, receiver 14, conductor 43,

, transmitter 15, conductor 44, spring contacts 20, 19, conductor 39, terminal .4, conductor 4", and terminal 4. The circuit which is bridged by' 7 comprises what I term circuit 8, consisting of the following elements-,""

8. Terminal 1, conductor 1 -to' terminal 1 conductor 36, spring contacts 24, 25, con ductor '40, terminal 5?, conductor 5", terminal v5, conductor .61, coil ,52, conductor 62, resistance 57 conductor 63, spring contacts 29, 28, conductor 59, terminal 3, con-, ductor 3", terminal 3,conductor 38, spring contacts 20, 19, conductor 39, terminal 4,

conductor 4", toterminal 4.

A talking circuit having been establishedcurrent being taken for the first partys re- L ceiver and transmitter and also the receiver and transmitter at sald additional station; all of said instruments being across the lme.

notbe interfered with. Furthermore, if said party atsaid additional station; upon findmg (by listening) that theline is inj use by 6 a talking circuit which has already been established, thereupon replaces the receiver at said: additional station upon its hookthe coin inserted by him-will-be returned, as there is only one receiverand-transmitter across the line, and coil 53 operates regardless of the'direction' in which the current is'flo'win'g therethrough; and there. being no resistance in the circuit which is established by his hanging ,up said receiver there is a strong-"current flowing therethrough. This circuit-is termed 9, and comprisesconductor 36, spring contacts 24, 23, conductor 37, terminal 2, conductor 2", terminal 2, conductor 58, coil 53, con-- .ductor 8 8, spring contacts 20, 19, conductor 39, terminal 4, conductor 4' and terminal 4. e

In the modified Wiring which is illustrated in Fig. 12, which is a diagram of the prepay box installed in a common battery (central operator) telephone system,the line wires Y and Z are electrically connected toterminals 2 and 4:. Terminal 5 is grounded, and is also connected to spring contact 28 by conductor Terminal 1 is electrically connected to coil 52 by conductor 61. Terminal 3 is connected to coil 53 byconductor 59. Coils 52 and 53 are connected to spring contact 29 by conductors 62 and 6%, respectively. Terminals 1, 2, 3 and 4, are connected to terminals 1*, 2, 3 and 4 of the telephone instruments by flexible conductors 1 2, 3 and i", respectively. Terminal l is electrically connected to spring contact 25, by means of conductor 45; terminal 2 is electrically connected to spring contact 24c by conductor 46; terminal 3 to spring contact 23 by conductore't'; P to transmitter 15, by conductor. 48; and transmitter 15 is connected to the receiver by conductor 49; and said receiver (14:) is connected to spring contact 26 by conductor 50. The ter minal 2 is electrically connected to the ringer 17 by conductor 67; ringer 17 is connected to condenser 16 by conductor 66; and said condenser to terminal 4: by conductor In the construction which is illustrated by Figs. 1 to 11 all inclusive, the signaling means are inoperative until a coin is deposited on the float arm, because until said coin is so deposited, (with the receiver ofi' the hook and said hook raised) said signaling mechanism is an element of what is hereinbefore designated as circuit No. 3; and

upon the deposit of a coin on the float arm of the device circuit No. l is established, with the signaling mechanism an element therein, and in operative condition; while in the modified construction or installation which is illustrated in Fig. 12 the signaling means, (including the ground from terminal 5) are rendered inoperative by being open at spring contacts 29 and 28, until a coin is deposited on the float arm. when a coin is so deposited spring contacts 29 and 28 are closed and a circuit is made which includes the ground, terminal 5, conductor 60 said contacts (28, 29), conductor 62, coil 52, conductor 61 and terminall. This circuit 1 term circuit No. 9.

It will be observed on referring to Fig. 12, that the conductor 62 is electrically connected at its ends to spring contact 28 and coil 52, while in the construction illustrated in diagram in Fig. 11, said spring contact 28, is electrically connected to said coil 52 by conductors 63 and 62, with the resistance coil interposed; and the omission of said resistance coil from said Fig. 12 is because of the fact that the operation is the same whether said resistance coil is present or absent; hence, in Wiring the device for use as in' said Fig. 12 the party making the installation may connect said spring contact 28 and said coil 52 in either manner.

Attention is directed to Fig. 11, Where it will be observed that with a coin on spring bar 33 (contacts 27 and 28 being thereby broken and contacts 28, 29 being made) the circuit which has been designated N0. 1 is established, and the direction of flow of current therethrough is determined by the receiver hooks at the calling and the called station. When the receiver hook at the calling station is up and the one at the called station is down the current through coil 52 diminishes the magnetism of the core of said coil; but, owing to the resistance coil 57 being in said circuit the core is not oppositely energized. When, under the last named conditions, the receiverhook at the called station is raised the flow of current through coil 52 and resistance coil 57-, is reversed, and the'magnetism of the core of said coil 52 is increased, and operatively energized, to move the armature 32 and float arm 30 to discharge the coin on the float arm into the safe W of the coin box.

I claim 1. In a telephone system, the combination of a plurality of talking and listening instrumentalities each thereof comprising a station, a prepay box, a float arm and a plurality of coils to control a coin on said float arm positioned in said prepay box, an intercommunication between the float arm and the signaling means for the purpose of maintaining the latter inoperative until a coin is supported by the float arm, and interconnections between the float arm and the coils for the purpose of making said'coils, when a coin is on said float arm, elements of circuits to make said signaling, means operative as a calling station, and coiiperatively with the receiver hooks which are positioned at said calling and at the called station to automatically control the disposition of said coin.

2. In a telephone system, the combination of talking and listening instrumentalities comprising movable receiver hooks, signaling mechanism, said instrumentalities and mechanisms adaptedto form elements in a calling and a called sub-station, a prepay box, a float arm and a plurality of coils to 6 w v p control a coin on said float arm positioned insaid box, an intercommuni cation between the float arm and the signaling mechanism for the purpose of shuntin the, latter until a coin is supported by the oat arm, and interconnections between the float arm and the of talking and llstening lnstrumentalltles,

and a plurality of coils to control a coin on sald float arm positioned in saidbox, an incalled substation, a prepay box, a float arm the signaling mechanism for the purpose of shunting the latter until a coin is supported by the float arm, and interconnections between the float arm, the receiver hooks, and the coils for the purpose of making said receiver hooks and sald coils, when a coin is on saidfloat arm, (and thereby said substation made-a calling station), elements of circuits to control the disposition of said I coin, and arranged so that the actuating one I as called stations.

i coin, said control obtained by a plurality of of said circuits is determined by the position of said receiver hook at the calling and I 4. In a telephone system, the combination of talking and listening instrumentalities, signaling mechanism, a receiver hook, a prepay box, a float arm and a plurality of coils tocontrol a coin on said float arm, in said pre-pay box, one of said coils beinga resistance coil, an intercommunication between the float arm and the si aling mechanism for the purpose of shuntlng the latter until a coin is supported by the float arm, and interconnections between the floatarm and the coils for the purpose of making said coils,

when a coin is on said float arm, elements of circults to control the disposltlon. of said circuits which are determined. by the position of said recelver hook, and said resistance coil and an additional one, of said coils forming elements in the one of said circuits which 1s made when the receiver hook is raised,

5. In a telephone system, the combination of talking and listening instrumentalities, signaling mechanism, a receiver hook, a prepay box, a float arm and a plurality of coils to ,control a coin on said float arm, in said pre-pay box, an intercommunication between the float arm and the signaling mechanism for the purpose of shunting the latter ties, and interconnections between the float arm and the coils for the purpose of making said coils, when a coin is on said'float arm, elements of circuits'to automatically control the disposition of said coin, and said control obtained by a plurality of circuits so which are determined by the position of said receiver hooks station.

6. In a telephone system, the combination of talking and listening instrumentalities,

signaling mechanism, a receiver hook, a prepay box, a float arm and a plurality of coils to control coin on said float arm, one of said coils-being a resistance coil, an intercommunication between the float arm and the signaling mechanism for the purpose of shunting the latter until a coin is supported by the float arm, selective mechanism, additional talking and listening instrumentali ties and an additional receiver hook, an interconnection between the signaling and the selectivemechanisms and between the selec-- tive mechanism and said additional talking and listening instrumentalities, and interconnections between the float arms and the coils-for the purpose of making said coils, when a coin is on said float arm, elements of circuits to control the disposition of said coin, and said control being effected by disposing circuits which are determined by the position of'said receiver hooks, said resistance coil and an additional one of the coils forming elements in the one of said circuits which is made when the receiver hook at the first named talking and listening instrumentalities is raised, said last named circuit remaining unbroken while a coin is on said 7 float arm. a I

7 In a telephone system, the combination of talking and listening instrumentalities, signaling mechanism, a receiver hook, a prepay box, line terminals, a float arm in'said pre-pay box, a coin retainer on said float arm, spring contacts and a mechanical connection. between said contacts also mounted on said float arm, an interconnecti'om between said contacts and the signaling mechanism for the purpose of shunting the latter until a com is supported" by said coin retainer to make a. calling station thereof, additional talking and listening instrumentalities and an additional receiver hook adapted to form a called station, a polarized relay for said float arm and a resistance coil, said relay and resistance coil arranged for increasing the 30' atsaidcalling' and a called 1 5 positio for collecting a coin on the retainer of the float arm, and for lessening, the magnetic force of said core, but not to energize it to actuate the floatarm when a current is flowing in the other direction through said lo relay and resistance .coils, interconnections between said coils and spring contacts and thel'ine terminals for obtaining a flow. of

said current in one directionwhen the calling station receiver hook is raised, and a 15. flow: of said current in, the other direction whenboth ofsaid receiver hooks are raised, j .and an additional-polarized relay for actuating the float-arm to throw the same into position for returning a coinon said retainer when a current is'gflowing' therethrough in' either direction, the circuitdn which said last named relay is an element being made by acoin on the retainer 'tof" the float arm zivith the calling'station hook.v receiver being own. 2

' FRANKLQFISHER.

"In the presence of f CierARLEs TURNnR BROWN, E. A. Wmcnrnn, 

